Struct MessageHeader 

pub struct MessageHeader {
    pub message_length: u32,
    pub command: u8,
    pub serial: u32,
    pub num_attributes: u32,
    pub attribute_data_len: u32,
    pub num_result_parts: u32,
}

The 21-byte binary message header for the native protocol.

All multi-byte fields are in native (little-endian) byte order. The C++ SDK’s exaBswap32 helper is a no-op on little-endian platforms (#ifdef WORDS_BIGENDIAN), so the wire format is LE on all x86/x64 Exasol deployments.

Fields

message_length: u32

Payload size after the header.

command: u8

Command code (e.g. CMD_EXECUTE, CMD_FETCH2).

serial: u32

Monotonically increasing message counter.

num_attributes: u32

Number of attributes following the header.

attribute_data_len: u32

Total byte length of attribute data.

num_result_parts: u32

Number of data parts in the payload.

Implementations

impl MessageHeader

pub fn new( command: u8, serial: u32, num_attributes: u32, attribute_data_len: u32, num_result_parts: u32, ) -> Self

pub fn serialize(&self) -> [u8; 21]

Serialize the header into a 21-byte array.

pub fn parse(data: &[u8; 21]) -> Result<Self, TransportError>

Parse a 21-byte array into a MessageHeader.

Trait Implementations

impl Clone for MessageHeader

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MessageHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for MessageHeader

impl PartialEq for MessageHeader

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MessageHeader